Direct current visual evoked potentials on light and dark adaptation process.

通过枕部直流放大记录视觉诱发电位（VEP），研究小鼠短期的光暗适应过程。刺激模式包括持续时间为10、50、100、500、1000ms的亮、暗阶跃函数和5、10、20Hz的亮、暗闪序列。从50个原始数据计算平均直流VEP和交流VEP（时间常数0.3s）。发现DC VEP的适应位移与光、暗刺激相对应，上移（负）为光适应，下移（正）为暗适应。具有自适应因子的列车VEP仿真拟合效果较好。提出了一个包含起效、偏移、适应、对比和延迟因素的VEP模型。向实验心理学研究者介绍了一些实验用的计算机程序，即EASY（EEG Analysis SYstem）。

Visual evoked potentials(VEP) were recorded by direct current amplification from Occipital to investigate the short term light and dark adaptation process. Stimulus patterns were light and dark step functions with the duration of 10, 50, 100, 500, 1000ms, and light and dark flash trains with 5, 10 and 20Hz. Averaged DC VEP and AC VEP(time constant 0.3s) were computed from 50 raw data. Adaptational shifts of DC VEP were found corresponding to light and dark stimulations: upward shift(negative) was for light adaptation and downward shift(positive) was for dark adaptation. Simulation of train VEP with adaptation factor was fitted better than without adaptation factor. A VEP model was proposed including onset, offset, adaptation, contrast and delay factors. Some of computer programs for experiment, EASY(EEG Analysis SYstem), were introduced to researchers of experimental psychology.